International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 10 | Oct 2025
p-ISSN: 2395-0072
www.irjet.net
Evaluation of the Performance and Stability of Dual Stator Induction Machine Using PID and H-Infinity Controllers Isidore U. Uju1, Bariakwaadoo S. Bere2 1Department of Electrical/Electronic Engineering, Chukwuemeka Odumegwu Ojukwu University,Uli, Anambra
State, Nigeria,+234-806-451-9778 2Department of Electrical/Electronic Engineering Technology, Kenule Beeson Saro-Wiwa Polytechnic, Bori, Rivers
State, Nigeria, +234-806-061-5520 --------------------------------------------------------------------------***---------------------------------------------------------------------Abstract The importance of induction machine is its reliability in operations which has increased its usefulness in the industries. The request for a better performance in its area of application call for research to handle its drawbacks like speed change with applied load, poor trajectory tracking capabilities and low frequency vibration. The main objective of this work was to analyse the performance and stability of dual stator induction machine using both PID and H-infinity controllers in order to ascertain the superiority of the later over the former. The implementation of the DSIM control strategy has to do with investigation of its performance improvement usng H-infinity compared to PID control method. The analysis considered 5N load condition with performance metrics like step response analysis (overshoot, rise time and settling time), bode and sigma plots analysis. The analysis of the complex vector model of the DSIM involved simulations using MATLAB/Simulink 2021b modelling software. From the evaluation, it was discovered that the H-infinity controller shows excellent torque stability, minimal torque overshoot and low current ripple. The time domain metrics shows that; PID had an overshoot, rise time and settling time of 4.6%, 0.213s and 0.598s respectively; H-infinity had an overshoot, rise time and settling time of 0%, 0.00227s and 0.00454s respectively. The frequency response analysis shows that PID controlled DSIM peak gain is 6.02dB and H-infinity controlled DSIM had a gain and phase margins of 52.5dB(at frequency of 0.0118rad/s) and 11.4 0(at frequency of 0.99rad/s) respectively. In sigma plot analysis, H-Infinity controller had a flatter shape having singular value above 0dB across the entire frequency range. The findings for current, torque and speed response shows that efficiency of H-infinity is the best of the two (PID and H-infinity) controllers. Time domain analysis shows that H-infinity controller is superior (over PID) in terms of overshoot, rise time and settling time as H-infinity delivers better system response with no overshoot and settles quickly after disturbance showing robustness. In sigma plot, H-infinity has flatter shape which indicate uniform preferences and robustness than PID especially at high frequencies.
Keywords: Performance, Stability, Dual Stator, Induction Machine, PID and H-Infinity 1.0 INTRODUCTION: 1.1Background of study A Dual Stator Induction Motor or Machine (DSIM) is an induction machine which has two separate three-phase stator windings, sharing the same machine core and the common squirrel cage rotor winding. The dual stator winding induction machineโs two windings have input terminals which are supplied separately with drive power. The two stator windings have a different number of poles to essentially eliminate the magnetic coupling between the two windings and to decouple the torques produced by each set of windings. Power is supplied to the two windings by two separate variable frequency inverter drives to provide two independently controllably torque components. At low speed, the power supplied to one of the windings can produce torque which opposes the torque from the power applied to the other winding, so that very low speed and standstill operation can be achieved while the frequency of the power supplied by the inverters is always greater than the minimum frequency. At higher operating speeds, power is supplied to the two windings so that the torque from the windings adds. The dual stator machine can be built with minimal modifications to standard winding configurations.
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